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WILLIAM BRANAGAN, QF'BURLINGTON, Iowa.

Leam Pafem No. 79,544, daad July jr, 186s.

IMPROVEMENT 1N STEAM-GENERATOR.

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TO ALL WHOM IT MAY CONCERN:

Beit known that I, .WILLIAM BRANAGAN, of Burlington', in the county of Des Moines, and State of Iowa, have invented certain new and useful Improvements in Steam-Boilers, and I do hereby declarethat the following is a full, clear, and exact description thereof, reference being. had to the accompanying drawings, making a part of this specification, in which- Y Figure 1 is a front external elevation of the improved boiler. Figure 2 is a similar view of'the'boiler with its outer casing or jacket removed. Figure 3 is a diametrical section, taken from front to rea-r through theboiler audits jacket. Figure 4 is a section through the boiler, taken in the horizontal plane indicated by red line :c a: in iig. 1. Figure 5 is a top view of the boiler with outer jacket'removed. v

Figure is an enlarged sectional view, showing one of the vertical water-pipes and several of thehhorizon-A tal ues.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to certain new and useful improvements on tubular upright steam-boilers, whereby provision is made-for obtaining in a boiler of a given watercapacity a much larger amount of heating-surface than can be obtained in any lsteam-boiler with whichIam acquainted. Provision is also made for obtaining great economy in fuel, preventing a loss of heat byradiation from the shell of the boiler, preventing the impingement of currents of cool air upon its sides, effecting a complete consumption of the inflammable gaseous products.

rising in the {ire-chamber before they reach the point of enit,` and also for utilizing a portion of` the heat for warming air, to be used for-heating a building in whichthe` boiler is located. l

The nature of my invention consists mainly in the application of the two upright cylindrical shells, constituting the principal portion of the boiler, of horizontal ilues, which pass radially through the water-space between the` said shells, and in the employment, in conjunction with dues thus arranged, of anumber oi vertical water-tubes, whichareapplied on the outside oi' the outer shell, and which communicate withthe water-space,

said vertical tubes being soarranged with relation to the horizontal ilues that the heated products of combustion, after escapingfthrough these lues, shall strike and impinge directlynpnn 4the vertical water-tubes, and thus communicate considerable heat to the water therein, as will be hereinafter described.

It also consists in the application, to a tubularupright boiler, having horizontal luespassing through lits water-spce, of a surrounding double-wall air-jacket, which is so lconstructed that it forms ari-external iiue chamber outside of the boiler, and also a non-conducting wall, which will coniine the'hcat around the boiler at the same time that it serves as a means for heating air to be used for warming`purposes, without in the least` interfering with the draught, as will be hereinafter described.-

To enable others skilled in the art to understand my invention", I will describe its constru'ctionand operation, In thenccompanying drawings, A represents' the intornal'cylindrical w'all or .shell of the boiler, which is 'provided with a grate, B, and a crown-sheet, A', as shown in iig. 3. Surrounding this internal shell is the external shell C, which extends above the crown-sheet A', and is capped b'ythe.. steam-dome C. lThese two shells constitute the boiler proper, and` they should be properly secured together and braced, so as to aiford the greatest possible strength. y

I 'Through'the two shells A C, a greatv number of holes are made, of suitable size and proper distance apart to receive through them the flue-'tubes a a a. These flue-tubes should b'e arranged in or nearly in horizontal planes, and'iu lines radiating from the centre of theboiler, as shown in figs. 3 and 4;v and itis desirable to have the tubes arranged, one above another, injor nearlyin vertical lines, as shown in figs. 2 and 3, for a purpose which will be hereinafter explained. These horizontal ilues' a a a may be secured in their places in any of-the well-known modes for securing flue-tubes to boiler-plates. I

To the outer side ofthe outer shell C of the boiler, and arranged in vertical lines around this shell C, are

a number of tubes, D D, which have their'ends bent, as shown in figs 2, 3, and 6, so that their upright portions will-stand out from the shell C short distances, and thusallow the products of combustion to escape freely through the ues a. These vertical tubes D are arranged directly opposite the several vertical rows of lines a, and are secured to the boiler-shell Cin any suitable manner, that is, by an elbow and nipple, and screwed into-the boiler, so that they can be removed at pleasure, when desired to clean or Vrepair the boiler. The lower ends oi' the tubes D communicate with the water-space below theiiues a a, and the upper ends of these tubes D co1n municate with the Water-space above the highest range of ilue's a.

Surrounding vthe outer shell of the boiler-is a double-wall jacket, E, which consists of two'separated walls, I1' b", having a space between them, for the circulation of air. This jacket is-set oil' from the shell C, so as to leave a space, Gr, around it, with an outlet at H, for tbe escape of the unconsumcd products of combustion.

Openings, c c,;are made through the outer plate Z2 ofthe jacket E, for the purpose of taking out the ashes that accumulate between the jacket and shell of the boiler, and for checking the steam when it gets-too high which openings are provided with suitable valves, d CZ, for regulating the size of said openings, and, when desired, for entirely closing them, at a suitable point near the top of the jacket E. `Inlets for cold air, and outletsy for conducting away the hot air from-.this jacket, forwarmin,r purposes, are formed in this jacket, as illustrated. An opening, J, is made through the'j'acketE near its bottom, which alfords ,access to the lire-door opening J. 7 The base K, upon which the boiler is mounted, ailords an ash-pit below the grate B, and also a support for the boiler.

'When 're ismadc inthe lire-chamber, within the inner shell A, the heated products of combustion will rise toward the dome A, andpass outward through all of the radial iues a t into the Hue-'space (7h-between the outer jacket E'andfthe boiler-shell C. The products thence rise and pass off through the chimney H, as indicated by thearrows in fig. 3. After escaping through the short radial lues a, the products of combustion will impinge upon the vertical water-tubes D, and subject these tubes and the water in them to considerable' heat, which would without them be carried otland wasted.

It will be s een that the boiler issubjected to heat on both sides, that is to say, the water will surround the fire-chamber, and the heated products, after leaving'this chamber, will pass through numerous tubes through the water-space, and then surround the water and lower steamspaces of the boiler.

l I not only greatly increase the tire-surface of the boiler by the use of the outside water-pipes D, as described, -but byhavng these pipes located directly opposite the flue-tubes, they will so far obstrct the outward escape of the `heated products of combustion through said ilues as to eect a' most complete combustion of the inam- 1 mable products. v

It will also be seen that I provide for preventing,` the escape of heat from around the boiler by the use of 'an air-jacket, which forms a non-conducting,r wall, which latter I make serve another purpose, namely, that of a heating-chamber for air to be used for warming-the building in which the boiler is erected.

kIt will also be seen that Athe ue and water-tubes are so completely enveloped by the heat that they are not liable to injurious expansion and contraction, and that the radial ilue-tubes aa canbe made so very short that they will not be liable to chokewith soot, consequently they will not require frequent cleaning. The 'great number of radial tubes leading from the tire-chamber will insure an excellent draught and perfect combustion.

Having described my invention, what claim as new, -and desire to secure by Letters Patent, is-f- 1. The rire-chamber A, `terminating in a gas-chamber, A', and with a curved top plate, in combination with the horizontal flues a a, and with the bentor angular water-pipes D, and with the outer case or water-jacket C, the said pipes Dbeing inserted intov the' jacket by horizontal branches vat'pointsA below the gas-chamber and below the first horizontal flue a, and the several parts being constructed and arranged together, substantially as described. v

2; lhe angular water-pipes D, arranged directly in, line with the ues a a, and inserted into the outer case or jaeketvC, and` applied in the space G all around the case C and below the crown-sheet A of the irebox or chamber, all substantially in the manner and for the purpose described.

-v 3. A double-wall air-heating jacket, E, applied to a steam-boiler, substantially as and for the' purposes described.

WILLIAM BRANAGAN.

Witnesses:

WILLIAM Gnunn'rr, HENRY I-I. SCOTT. 

